I have my VHF mobile connected directly to the battery so it has power all the time and has to be manually turned on and off.
Does anyone know of a simple circuit that would use one of the switched power lines to watch if the car is on and then turn the radio on?
I was actually thinking this migh be as simple as a reed switch or something and using the power line from the ignition to close the contacts. Heck it might even be possible to use a 555 to add a short on off delay.
I was just,wondering if anyone had done anything like that before.
Put a simple 12V auto relay in the line with the control line connected to a convenient switched terminal on the fuse panel. Probably about $10 and 20 minutes to install it. This was standard on commercial installations for years.